简介:Time-to-DigitalConverter(TDC)isakeyblockusedasthephase/frequencydetectorinanAll-DigitalPhase-LockedLoop(ADPLL).Usually,itoccupiesalargeproportionofADPLL'stotalpowerconsumptionuptoabout30%to40%.Inthispaper,thedetailedpowerconsumptionofdifferentcomponentsintheTDCisanalyzed.APowerManagementBlock(PMB)ispresentedfortheTDCtoreduceitspowerconsumption.A24-bitsTDCcorewiththeproposedPMBisimplementedinHJTC0.18μmCMOStechnology.Simulationresultsshowthatupto84%powerreductionisachievedusingourproposedtechnique.
简介:Objective:Todetectthemodulationofcytokinesproductionbyacutepromyelocyticleukemia(APL)cellsbeforeorafterexposuretoall-transretinoicacid(ATRA).Methods:DiagnoseswereperformedaccordingtotheFABcytologicalclassificationcriteriaandcytogeneticcriteria.BonemarroworbloodsamplesfromAPLpatientswerecollectedinheparinizedmicrofugetube.PrimaryAPLcellswereseparatedandpurifiedbytraditionalFicoll-Hypaquedensitycentrifugationandenrichedafteradherencetoplasticsurfaces.IL-1(,IL-6,IL-8,TNF(andG-CSFlevelsinthesupernatantsofculturedleukemiacellswereestimatedbyELISAmethod.NBTmethodwasusedtodetectthedifferentiationofAPLcellsatthesametime.Results:96hafterexposuretoATRAat10-6Minvitroor60mg/dayinvivo,APLcellsshowedasignificantincreaseofIL-1((P<0.05)andG-CSF(P<0.05)production,andasignificantdecreaseofIL-6(P<0.05)andIL-8(P<0.05),however,therewasnoobviousvariationofTNF(.Ontheotherhand,theproliferationofAPLcellsinvitrowasstatisticallycorrelatedtotheIL-1(secretionorG-CSFsecretion.AndthecellnumberratioinpatientswithdetectableIL-1(orG-CSFwashigherthanthatwithoutdetectableIL-1(orG-CSF.Conclusion:IL-1(andG-CSFsecretionmayplayanimportantroleintheproliferationofAPLcellsafterexposuretoATRA.
简介:Wehavestudiedaswitchablehyperbolicmetamaterialcomposedofagraphene–dielectricperiodicstructure.Bytuningthechemicalpotentialofallgraphenesheetssimultaneously,theisofrequencycurvecanswitchbetweenanellipseandahyperbolaconveniently.Inparticular,aspecialhyperbolicisofrequencycurvewithitsasymptoteperpendiculartotheinterfaceisobtainedandusedtorealizethezeroreflectioneffect.Furthermore,azeroreflection-basedopticalswitchworkingintheterahertzspectrumisdemonstrated.Itsbandwidthcanbeefficientlyadjustedbygeometricparameterssuchaspermittivityandperiod.Suchanopticalswitchpossessesthemeritsoflowloss,hightransmittancecontrast,highresponsespeed,compactsize,hightoleranceofchemicalpotential,andhavingallincidentangles(0°–90°)simultaneously.Suchanopticalswitchholdsgreatpotentialinmanyfields,suchasdatastorage,beamsteering,andintegratedphotoniccircuits.
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简介:一个新奇计划所有光并且门基于一个Fabry-Perot半导体,光放大器(FP-SOA)被建议,它的可行性被模拟验证。用这个计划,所有光并且门能与10dB的扑灭比率被认识到。扑灭比率上的脉搏间隔和脉搏宽度的影响也被调查。
简介:AlowjitterAll-DigitalPhase-LockedLoop(ADPLL)usedasaclockgeneratorisdesigned.TheDigital-ControlledOscillator(DCO)forthisADPLLisaseven-stageringoscillatorwiththedelayofeachstagechangeable.BasedontheImpulseSensitivityFunction(ISF)analysis,aneffectivewayisproposedtoreducetheADPLL'sjitterbythecarefuldesignofthesizesoftheinvertersusedintheDCOwithasimplearchitectureotherthanacomplexone.TheADPLLisimplementedina0.18μmCMOSprocesswith1.8Vsupplyvoltage,occupies0.046mm2ofon-chiparea.Accordingtothemeasuredresults,theADPLLcanoperatefrom108MHzto304MHz,andthepeak-to-peakjitteris139pswhentheDCO'soutputfrequencyis188MHz.
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简介:SincethereformandopeningupofChina,theCommunistPartyofChinahasbeencommittedtothecontinuousdevelopmentofhumanrightstheoryandtheprotectionofhumanrightsthroughlegalconstruction,inordertopromotethedevelopmentofChina’shumanrightscause.Theprincipleof'respectingandprotecting
简介:Asakindoftwo-dimensionaltransitionmetaldichalcogenidematerial,tungstendiselenide(WSe2)hasattractedincreasingattention,owingtoitsgappedelectronicstructure,relativelyhighcarriermobility,andvalleypseudospin,allofwhichshowitsvaluablenonlinearopticalproperties.TherearefewstudiesonthenonlinearopticalpropertiesofWSe2andcorrelationwithitselectronicstructure.Inthispaper,theeffectsofspatialself-phasemodulation(SSPM)anddistortioninfluenceofWSe2ethanolsuspensionsaresystematicallystudied,namely,thenonlinearrefractiveindexandthird-ordernonlinearopticaleffect.WeobtainedtheWSe2dispersionsSSPMdistortionformationmechanism,andthroughit,wecalculatedthenonlinearrefractiveindexn2,nonlinearsusceptibilityχ3,andtheirwavelengthdependenceundertheexcitationof457nm,532nm,and671nmlasers.Moreover,byuseofitsstrongandbroadbandnonlinearopticalresponse,all-opticalswitchingoftwodifferentlaserbeamsduetospatialcross-phasemodulationhasbeenrealizedexperimentally.Ourresultsareusefulforfutureopticaldevices,suchasall-opticalswitchingandall-opticalinformationconversion.
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简介:All-opticalswitchinghasbeentheoreticallyanalyzedinthe3,3'-diethyl-2,2'-thiatricarbocyanineiodide(DTTCI)carbocyaninedyethatexhibitslargeexcited-stateabsorptiontoachievehighcontrastandfastswitching.Switchinghasbeenanalyzedbothnsandpspumppulsewidths.Itisshownthatthereisanoptimumvalueofconcentrationforgivenpeakpumpintensityatwhichmaximummodulationcanbeachieved.Wecanget93.84%modulationoftransmissionofaCWprobelaserbeamat532nmatpeakpumpingintensityof500kW/cm2at763nm,with?t=1nsandconcentrationof80μMinalcohol,resultinginswitch-offandontimeof2nsand8ns,respectively.Theresultshavebeenalsousedtodesignall-opticalNOTandtheuniversalNORandNANDlogicgateswithmultiplepumplaserpulses.
简介:Wepresenthereaseriesofperylenediimide(PDI)basedisomericconjugatedpolymersfortheapplicationasefficientelectronacceptorsinall-polymersolarcells(all-PSCs).BycopolymerizingPDImonomerswith1,4-diethynylbenzene(para-linkage)and1,3-diethynylbenzene(meta-linkage),isomericPDIbasedconjugatedpolymerswithparallelandnon-parallelPDIunitsinsidebackboneswereobtained.Itwasfoundthatpara-linkedconjugatedpolymer(PA)showedbettersolubility,strongerπ-πstacking,morefavorableblendmorphology,andbetterphotovoltaicperformancethanthoseofmeta-linkedconjugatedpolymers(PM)did.DevicebasedonPTB7-Th:PA(PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl})showedsignificantlyenhancedphotovoltaicperformancethanthatofPTB7-Th:MA(3.29%versus0.92%).Moreover,thephotovoltaicperformanceofthesepolymericacceptorscouldbefurtherimprovedviaaterpolymericstrategy.Bycopolymerizingasmallamountofmeta-linkagesintoPA,theoptimizedterpolymericacceptorsenabledtoenhancephotovoltaicperformancewithimprovedtheshort-circuitcurrentdensity(Jsc)andfillfactor(FF),resultinginanimprovedpowerconversionefficiency(PCE)of4.03%.
简介:Anoptimalpowerdistributionanalysisforanall-opticalsamplingorthagonalfrequencydivisionmultiplexing(OFDM)schemewithmultiplemodulationformatsincludingdiferentialphaseshiftkeyed(DPSK),diferentialquadraturephaseshiftkeyed(DQPSK),andnon-return-to-zero(NRZ)isproposed.Thenoisetolerancesofdifferentmodulationformatsareanalyzed,andtheoptimalinputpowerratiobetweenphaseandintensitymodulationformatsforthebestoverallreceivingperformanceisinvestigatedunderunchangedtotalinputpower.Moreover,thisschemecanseamlesslycoexistwiththetraditionalWDMchannel.
简介:Inpastyears,rare-earth-dopedfluoridefiberlasers(FFLs)havedevelopedrapidlyinthemid-infrared(mid-IR)region.However,duetothelackoffiberopticdevicesandchallengeoffluoridefibersplicing,mostmid-IRFFLshavebeendemonstratedwithfree-spaceopticelements,limitingtheadvantagesofall-fiberlasersforflexibledelivery,stability,andcompactness.Here,wereport,tothebestofourknowledge,thefirstpulsedall-fiberFFLinthemid-IRregion.Bytakingadvantageoftheintegrationofblackphosphorusflake,stableQ-switchedandmode-lockedpulseswereobtainedat2.8μmwavelength.Webelievethatthisall-fiberdesignwillpromotetheapplicationofpulsedFFLinthemid-IRregion.
简介:Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.